hooking up a/f and voltemeter gauges...
 

I have an a/f gauge in my turbo volvo, and I'm thinking of buying a dual POD for the 2002 mustang with an a/f gauge and voltmeter (or something else, any suggestions?)...I know that the a/f gauge was connected to 1 wire on my o2 sensor on my volvo, is it the same for the mustang? If so, which wire, where is the o2 sensor...Secondly, how do I hook up a voltemeter without hooking it up to the stock voltmeter? I don't want to drill threw the a-pillar, so I will run the wires behind it. Is there any place in the driverside firewall to stick some wires through? Thanks,